Fake IWC IW545120: How to Spot One

Answer first: there is no single tell. A counterfeit IW545120 exposes itself through several small errors at once, most often in the caseback engraving, the dial print, and the movement. Check four things before you trust a watch: the reference and serial stamps, the measured case dimensions, the printing on the dial, and the finish and markings on the movement. If two or more of those fail, treat the watch as counterfeit.

What You Need

  • A 10x jeweler's loupe
  • Digital calipers
  • A postal scale accurate to 1 gram
  • A bright light you can angle
  • The published IWC specification for the reference, including case size, movement, and power reserve
  • A clear photo of a genuine IW545120 dial and caseback for side-by-side comparison

Step-by-Step Authentication

  1. Write down the full reference number and the serial number from the caseback before you touch anything else.
  2. Confirm the stamped reference matches the case material and finish shown in the listing, since a steel reference should never appear in gold.
  3. Measure the case diameter, thickness, and lug width with calipers, then compare each figure to the published specification. Fakes usually run 0.5 to 1 mm oversized.
  4. Weigh the watch head. A genuine piece in steel sits inside a narrow weight band, while a counterfeit feels light because of a hollow case or a thin movement.
  5. Hold the watch at an angle to the light and study the crystal. Sapphire stays clear with no rainbow haze, while mineral glass shows color fringing near the edges.
  6. Inspect the dial print with the loupe. Letters should be sharp, evenly spaced, and level with the dial center. Fakes show thick edges, uneven spacing, or print that sits off-center.
  7. Check the date window if the reference has one. The aperture should be crisp and centered, and the numerals should be thin and consistent with IWC's typeface.
  8. Study the hands and applied indices. Edges should be polished rather than rough, and lume should sit inside the frame without spilling onto the dial.
  9. Turn the crown. Winding should feel smooth and even, and the crown should pull to each position with a firm click.
  10. Look at the caseback engraving under the loupe. Genuine stamps have depth, clean shoulders, and uniform letter height, while laser-etched fakes look shallow and slightly blurred.
  11. Have a watchmaker open the case and inspect the movement: bridge finishing, engraving, jewel count, and rotor decoration all need to match the reference.
  12. Compare the bracelet or strap hardware, clasp stamps, and spring bar quality against the reference specification.
  13. Check the box, booklet, and warranty card for print quality and for serial numbers that agree with the watch.
  14. Send the serial number to IWC service or an authorized dealer for confirmation before you pay.

Red Flags That Appear Together

  • Caseback fonts that do not match the production period of the reference.
  • Dial text that is thicker on one side than the other.
  • A case that measures larger than the published specification.
  • Movement decoration that stops at the edges of the bridges.
  • Box, papers, and watch carrying mismatched or missing serials.

Before You Buy

Ask for macro photos of the caseback and the movement, not one front-on shot of the dial. Request the serial number in writing on the invoice. If the seller refuses an opening by a qualified watchmaker, walk away from the deal.